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Configuring Static DHCP IP Addresses

 

Configuring Static DHCP IP Addresses for DHCP snooping (ELS)

Note

This task uses Junos OS for EX Series switches with support for the Enhanced Layer 2 Software (ELS) configuration style. If your switch runs software that does not support ELS, see Configuring Static DHCP IP Addresses for DHCP snooping (non-ELS). For ELS details, see Using the Enhanced Layer 2 Software CLI.

You can add static (fixed) IP addresses and bind them to fixed MAC addresses in the DHCP snooping database. These bindings are labeled static in the database, while those bindings that have been added through the process of DHCP snooping are labeled dynamic. Static IPv6 address assignment is also available for DHCPv6.

Before you can perform this procedure, you must configure the VLAN. See Configuring VLANs for EX Series Switches with ELS Support (CLI Procedure).

To configure a static IP address to MAC address (IP-MAC) binding in the DHCP snooping database, you must first create a group of access interfaces under the [edit vlans vlan-name forwarding-options dhcp-security] hierarchy. Creating this group automatically enables DHCP snooping, which is a prerequisite for creating the DHCP snooping database. You can then configure a specific interface within the group to have a static IP address that is bound to a fixed MAC address. If you want to have multiple static IP addresses, configure additional interfaces within the same group.

Note

On switches that support DHCPv6, creating the group of interfaces will automatically enable both DHCP and DHCPv6 snooping.

To configure a static IP-MAC address binding in the DHCP snooping database:

  • [edit vlans vlan-name forwarding-options dhcp-security]

    user@switch# set group group-name interface interface-name static-ip ip-address mac mac-address

To configure a static IPv6-MAC address binding in the DHCPv6 snooping database:

  • [edit vlans vlan-name forwarding-options dhcp-security]

    user@switch# set group group-name interface interface-name static-ipv6 ip-address mac mac-address

In the following example, a device with static IP allocation is connected to the ge-0/0/1 interface, which belongs to vlan-A. To configure this device to connect to the external network:

[edit]

user@switch# set vlans vlan-A forwarding-options dhcp-security group static-group interface ge-0/0/1 static-ip 10.1.1.6 mac 00:00:00:44:44:06

To verify that the configuration is configured on the device:

To verify that a binding entry is created for the static client:

user@switch> show dhcp-security binding

Configuring Static DHCP IP Addresses for DHCP snooping (non-ELS)

You can add static (fixed) IP addresses and bind them to fixed MAC addresses in the DHCP snooping database. These bindings are labeled static in the database, while those bindings that have been added through the process of DHCP snooping are labeled dynamic.

Note

This task uses Junos OS for EX Series switches that do not support Enhanced Layer 2 Software (ELS) configuration style. If your switch runs software that does support ELS, see Configuring Static DHCP IP Addresses for DHCP snooping (ELS). For ELS details, see Using the Enhanced Layer 2 Software CLI.

To configure a static IP-MAC address binding in the DHCP snooping database:

[edit ethernet-switching-options secure-access-port]

user@switch# set interface interface-name static-ip ip-address vlan data-vlan mac mac-address

To configure a static IP-MAC address binding in the DHCPv6 snooping database:

[edit ethernet-switching-options secure-access-port]

user@switch# set interface interface-name static-ipv6 ip-address vlan data-vlan mac mac-address

To view results of the configuration steps before committing the configuration, type the show command at the user prompt.

To commit these changes to the active configuration, type the commit command at the user prompt.

Configuring Static DHCP IP Addresses for DHCP snooping (MX routers)

You can add static (fixed) IP addresses and bind them to fixed MAC addresses in the DHCP snooping database. These bindings are labeled as static in the database, while those bindings that have been added through the process of DHCP snooping are labeled dynamic.

To configure a static IP address/MAC address binding in the DHCP snooping database, you must first create a group of access interfaces under [edit bridge-domains bridge-domain-name forwarding-options dhcp-security]. Creating this group automatically enables DHCP snooping, which is a prerequisite for creating the DHCP snooping database. The following procedure shows the configuration in two steps, but it can be done in one. You can then configure a specific interface within the group to have a static IP address that is bound to a fixed MAC address. If you want to have multiple static IP addresses, configure additional interfaces within the same group.

To configure a static IP address and MAC address binding in the DHCP snooping database:

  1. Create a group by including an access interface:
  2. Configure a static IP address: